Marine Hand Freshwater Pump

I. Product Overview

Marine Hand freshwater pumps are the "manual power source" of ship emergency freshwater supply systems, designed specifically for emergencies such as power outages and freshwater system failures. By manually rotating the crank handle to drive plunger or gear structures, they pressurize and deliver clean water from emergency freshwater tanks to key areas such as crew living quarters, medical rooms, and fire hydrants, ensuring basic freshwater supply is maintained when the ship loses power. Constructed with cast iron (HT200), brass (H62), or stainless steel (304) as the main material, they achieve self-priming and low-pressure delivery through purely mechanical transmission, without requiring electrical or hydraulic assistance. They are compatible with media such as drinking freshwater and cleaning water. The pump body undergoes rust-proof treatment and precision assembly, with a service life of ≥10 years in -10℃~60℃ environments. It meets IMO Ship Emergency Freshwater System Specifications (MSC.457(100)) and emergency equipment certification requirements of classification societies such as RS, LR, ABS, and CCS, widely used in emergency freshwater supply systems of cargo ships, fishing boats, passenger ships, and other vessel types.

II. Core Technologies and Material Characteristics

1.Material Selection and Performance

2.Key Technical Parameters

Flow range: 1-5L/min, with a single continuous operation at 30 rpm delivering 3-6L of freshwater, meeting short-term drinking water needs of 4-6 people

Output pressure: 0.3-1.2MPa, adapting to emergency freshwater pipeline resistance (including filter and check valve losses) to ensure freshwater reaches water points directly

Medium compatibility: Capable of conveying drinking freshwater (meeting GB 5749 standards), washing water, medical pure water, with temperatures ranging from -10℃ to 60℃ and turbidity ≤5NTU

Self-priming performance: Self-priming height ≥2m, priming time ≤30 seconds (for 20℃ clean water), capable of directly drawing water from low-level emergency freshwater tanks without manual priming

Operating force requirement: Crank handle operating force ≤35N (approximately 3.5kgf), enabling one person to deliver 15-20L of freshwater by continuous cranking for 5 minutes, meeting emergency medical flushing or drinking water supply needs

3.Safety and Sanitation Design

Food-grade material contact: Flow components use brass or 304 stainless steel (meeting GB 4806.11 standards) with smooth, dead-angle-free inner walls to prevent bacterial growth, ensuring effluent colony count ≤100CFU/mL

Anti-backflow contamination: A sanitary check valve installed at the outlet prevents residual water in pipelines from flowing back to freshwater tanks after shutdown, ensuring water quality is not re-contaminated

Tilt resistance: Elastic fixing between pump body and base allows the pump to withstand ship heel of ±15° and trim of ±10° with flow rate attenuation ≤5%

III. Technical Advantages and Innovative Design

1. Emergency Operation Convenience

Dual-plunger alternating structure: Adopts main and auxiliary dual-plunger reciprocating design, completing 2 suction-discharge cycles per crank rotation. Flow rate is 60% higher than single-plunger pumps with pressure fluctuation ≤±0.03MPa, ensuring stable, pulse-free water output.

Labor-saving transmission system: Uses "gear reduction + eccentric wheel" combined mechanism to amplify crank torque by 3 times, reducing operating force by 35% compared to traditional hand pumps at the same flow rate, suitable for operation by female crew or those with weaker physical strength.

Foldable crank design: Crank can be folded 90°, with an extended length of 700mm (labor-saving lever) and folded length of 350mm, saving storage space and facilitating use in narrow cabins.

2. Sanitation and Corrosion Resistance Enhancement

Inner wall polishing: Brass flow components undergo electrolytic polishing (Ra≤0.8μm) to reduce scale adhesion, requiring cleaning only once a quarter to meet sanitation requirements, extending maintenance intervals by 50% compared to ordinary brass pumps.

Stainless steel rust-proof technology: 304 stainless steel components undergo passivation treatment, showing no rust after 3000 hours of immersion in 3% salt spray environment, suitable for long-term storage in high-humidity ocean-going environments.

Cast iron pump anti-corrosion upgrade: HT200 pump chambers are sprayed with food-grade epoxy resin coating (0.2mm thickness) to resist freshwater erosion and prevent water contamination from rust.

3. Ship Emergency Adaptability

Lightweight and portable design: Single unit weight ≤12kg (3L/min model) with a carrying hook and 5m food-grade hose, enabling rapid transfer to key areas such as medical rooms and bridges to meet multi-point emergency water supply needs.

Low-temperature anti-freezing design: In -10℃ environments, pump transmission parts are filled with low-temperature grease (dropping point ≥-20℃) to ensure smooth crank rotation without jamming, suitable for ships sailing in polar or frigid zones.

IV. Typical Application Scenarios

1. Domestic Emergency Water Supply

Crew drinking water supply: When the main freshwater system of a cargo ship fails, stainless steel Hand freshwater pumps (flow 2-3L/min, pressure 0.6MPa) are used to replenish drinking water tanks via food-grade hoses. One person cranking for 10 minutes can store 30L of drinking water, meeting the basic needs of 10 people for one day.

Cleaning water guarantee: When water supply to coastal passenger ship toilets is interrupted, brass hand pumps (flow 3-4L/min, pressure 0.5MPa) deliver freshwater to sinks and toilets, maintaining basic hygiene conditions.

2. Medical and Safety Scenarios

Emergency medical flushing: When fishing boat crew are injured, portable 304 stainless steel hand pumps (flow 1-2L/min) connect to medical spray guns, providing stable 0.3MPa water flow to flush wounds, reducing infection risk when used with first-aid kits.

Fire emergency water replenishment: When water pressure in small passenger ship fire hydrants is insufficient, Hand freshwater pumps (flow 4-5L/min, pressure 0.8MPa) replenish fire buckets to assist in extinguishing initial fires (e.g., electrical fires).

3. Extreme Environment Adaptation

Polar low-temperature water supply: During navigation in -10℃ ice zones, stainless steel hand pumps with insulation jackets (flow 2-3L/min) deliver -5℃ emergency freshwater to the bridge, with outlet water temperature ≥5℃ to avoid crew discomfort from cold water.

Tropical high-temperature use: In 45℃ engine room environments, brass hand pumps maintain a surface temperature ≤40℃ after continuous operation for 1 hour, posing no scald risk and ensuring safe operation.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Usage scenarios: Brass or stainless steel pumps for drinking water; 304 stainless steel pumps mandatory for medical water; cast iron pumps optional for inland short-haul ships

Flow matching: Configure according to 5L emergency water consumption per person per day. For example, a 50-person ship requiring 250L daily water needs a pump with flow ≥2L/min (based on 4 hours of operation)

Pressure requirements: 0.3-0.5MPa for direct drinking or washing; 0.6-1.0MPa for medical flushing or fire water replenishment

2. Maintenance Points

Daily inspection: Crank 20 turns weekly to check water output smoothness and leaks, ensuring availability in emergencies

Regular maintenance: Disassemble and clean plungers and valve seats every 6 months, replace aging seals (food-grade silicone rubber), and apply food-grade grease to transmission parts

Sanitation maintenance: Rinse pump bodies with 5% citric acid solution for 10 minutes quarterly to remove inner wall scale, followed by 3 passes of pure water flushing

3. Compliance Inspection

Annual classification society inspection focusing on verifying water quality safety (heavy metal content ≤0.01mg/L), flow stability, and sanitation compatibility

Meets IMO requirements for ship emergency freshwater systems, ensuring emergency freshwater supply can be established within 5 minutes after main system failure

VI. Compliance and Certification

International standards: Complies with ISO 8316 Marine Manual Pump Performance Standards and IMO MSC.457(100) Emergency Freshwater System Specifications

Classification society certifications: Obtained type approval for Hand freshwater pumps from RS, LR, ABS, and CCS (including 500-hour clean water circulation tests and sanitation performance verification)

Domestic specifications: Meets requirements for ship emergency freshwater equipment in Technical Rules for Statutory Survey of Seagoing Ships Sailing in Domestic Waters, with flow components complying with GB 4806.11 food contact standards